How dare you, said in my best Greta voice. Yes, the pinch is distracting and I only suggested it to see of there are any leaks. It's not something to do regularly. Your restless sleep will have an impact, as do many other things. I have found this works best for me when I do it within 30 of waking up and on an empty stomach. Next thing you may try from time to time is hold breath on a deep inhale. Your time should increase suggnificantly but that not the true goal. What I have found is that process leads to a deeper meditative state and is more relaxing. Holding on the exhale is more for building physical endurance, the inhale for relaxation of the mind. All just my opinion and personal experience.
The last 3 times I have been taking a deep breath after the 3rd round and holding. The 2nd time I felt like I was passing out and took a breath. Last night I thought if I kept holding it in, I was easily going to pass out. I had no urge to breath but my mind was starting to wander off. It was interesting and when I did exhale, I had to force myself to inhale for some reason. it wasn't coming naturally.